Thermoplastic resin, organic-inorganic hybrid composition and optical parts

Abstract

An optical part comprising a thermoplastic resin having a recurring unit represented by the following formula (1):wherein R represents a hydrogen atom, an alkyl group, or an aryl group; G represents a divalent linking group; A represents an oxygen atom, a sulfur atom, or —N(R1)—; R1 represents a hydrogen atom, an alkyl group, or an aryl group; Q represents an atomic group of forming a hetero ring; and l indicates 0 or 1.

Description

TECHNICAL FIELD[0001]The present invention relates to a thermoplastic resin having high refractivity and excellent in transparency, workability, heat resistance and coloring resistance, to an organic-inorganic hybrid composition excellent in high refractivity, transparency, lightweightness and workability, and also to optical parts such as lens substrates comprising them (e.g., lenses for spectacles, lenses for optical instruments, lenses for optoelectronics, laser lenses, pickup lenses, in-vehicle camera lenses, mobile camera lenses, digital camera lenses, OHP lenses), etc.BACKGROUND ART[0002]Recently, studies of optical materials are being made actively, and in particular, in the field of lens materials, it is much desired to develop materials excellent in high refractivity, low dispersion (high Abbe's number), heat resistance, transparency, easy shapability, lightweightness, chemical resistance, solvent resistance, etc.[0003]As compared with inorganic materials such as glass, pla...

AI Technical Summary

Benefits of technology

[0011]The present invention has been made in consideration of the above-mentioned current situation in the art, and its object is to provide an optical part which satisfies high refractivity, heat resistance, transparency, lightweightness and workability and of which the refractive index can be controlled in any desired manner, and to provide a thermoplastic resin and an organic-inorganic hybrid composition useful for producing the optical part.

[0013]The optical part of the invention has high refractivity and is excellent in heat resistance, transparency, lightweightness and workability. The organic-inorganic hybrid composition satisfies high refractivity, heat resistance, transparency, lightweightness and workability. The thermoplastic resin of the invention has a novel recurring unit, and is excellent in high refractivity, heat resistance, transparency, lightweightness, workability and coloring resistance. According to the invention, the refractivity of the optical part can be controlled in any desired manner.

Problems solved by technology

Recently, however, it is desired to further increase the refractivity of the lenses for thinning them; however, polycarbonate could not fully satisfy the requirement.

However, the patent reference says nothing relating to the refractivity and the coloring resistance of the resin, and the usefulness of the material for optical parts is still unknown.

Although the above proposals have been made to attain higher refractivity of resins, a plastic material having high refractivity and good transparency and capable of being a substitute for glass has not as yet been developed.

However, primary particles having a particle size of at most 15 nm tend to aggregate extremely easily, and therefore it is extremely difficult to uniformly disperse the particles in a resin material.

These comprise inorganic fine particles dispersed in a resin, but could not exhibit sufficient properties from the viewpoint of dispersing the fine particles in a resin matrix at a high concentration without lowering the transparency of the resin.

Also reported is an organic-inorganic composite composition in which the surface-modifying group of inorganic particles is bonded to a resin via a linker (JP-A 2004-352975); however, this is problematic in that the bonding formation requires high-temperature operation, and in addition, the composition may gel and therefore could not exhibit sufficient properties from the viewpoint of the shaping workability thereof.

However, the lenses are problematic in that the heat resistance of the resins is low and the resins color in thermal shaping; and therefore, they have problems in their production methods and in the products themselves.

Images